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Advisory record · GHSA-cvw4-55pp-3hfq

Yamcs's Missing Authorization on Role and Privilege Enumeration Endpoints Allows Any Authenticated User to Disclose Full Security Configuration

CVSS 4.3 MediumEPSS 0.0034 · 27th percentile

Published by the GitHub Advisory Database at 28 Aug 2026, 17:13 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.yamcs:yamcs-coreMaven>=5.13.0, <5.13.2 || <5.12.85.13.2, 5.12.8
Identifiers
GHSA-cvw4-55pp-3hfq · CVE-2026-55547
Weakness (CWE)
CWE-285 · CWE-862
Tags
Published
28 Aug 2026
Updated
28 Aug 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Yamcs (org.yamcs:yamcs-core) versions 5.13.0 before 5.13.2 and versions before 5.12.8 are affected. Three IAM API endpoints, which list roles and privileges, lack authorization checks, so any authenticated user can retrieve the full privilege list and role definitions, which the source says could help plan privilege escalation. Upgrade to version 5.13.2 or 5.12.8. The source gives no workaround.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
4.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0034, the 27th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:19 UTC First seen by agentprime
  2. 31 Oct 2026, 14:19 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.